Parallel amplitude-phase calibration method and system for phased-array antenna

Abstract

The invention provides a parallel amplitude-phase calibration method and a parallel amplitude-phase calibration system for a phased-array antenna. The method comprises a calibration signal setting step: setting a single-frequency calibration signal to be incident on the phased-array antenna, or to be transmitted through the phased-array antenna; an initial state setting step: selecting a pluralityof antenna units on the phased-array antenna, and setting the phase shifter of each selected antenna unit to be in an initial state; a modulation step: carrying out periodic phase modulation on the phase shifter of each selected antenna unit; and an analysis step: analyzing the harmonic characteristics of the received single-frequency calibration signal to calibrate the amplitude and phase of thecorresponding antenna unit. According to the invention, a plurality of units of the phased-array antenna can be simultaneously calibrated (the number of units calibrated at the same time is not limited), and the amplitude and the phase of each unit channel are calculated by carrying out harmonic characteristic analysis on the received calibration signal.

Description

technical field [0001] The invention relates to the technical field of antenna engineering, in particular to a parallel amplitude and phase calibration method and system for a phased array antenna. Background technique [0002] The active phased array antenna is composed of multiple units, and each unit contains multiple circuit units such as an antenna unit, a transceiver switch, a low noise amplifier, a power amplifier, a phase shifter, and a variable gain amplifier. Affected by various factors such as power supply, working environment, and component aging, the amplitude and phase of each unit of the phased array antenna will change. Therefore, when using an active phased array antenna, it is necessary to regularly or irregularly calibration. [0003] At present, the mainstream amplitude and phase calibration methods of active phased array antennas are compared in "Quick Calibration Methods for Phased Array Antennas" written by Wang Huanju et al., including near-field met...

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Problems solved by technology

Among them, the near-field method requires very complicated electromagnetic field measurement equipment, which is usually suitable for calibration inside the laboratory; the internal monitoring method requires additional hardware costs; the mid-field calibration method requires the position of the transmitting and receiving antenna to be in the mid-field interval, which is not suitable for medium and long distances calibration; the rotation vector method can usually only calibrate one unit at a time, and needs to traverse the state of each phase shifter, and the calibration time is longer; the commutation method has the problem of unstable inversion of the commutation matrix, and the algorithm complexity is also high; The four-phase amplitude calibration method proposed in the article has high requirements for the phase shift number and direction shift accuracy of the phased array antenna

[0004] In summary, the existing amplitude and phase calibration methods for active phased array antennas are either only suitable for laboratory or short-distance measurements, or there are problems such as low calibration efficiency, complex algorithms, and high hardware dependence.

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